????Service中有四個重要函數： ?

????public?IBinder?onBind(Intent?arg0)；????//必須實現，返回接口給Servicepublic?void?onCreate()；????????????????//Service創建時調用public?void?onStart(Intent?intent,int?startId)；//通過startService（）會調用public?void?onDestroy()；????????????????//銷毀時StopService()調用

?

通過StartActivity（）函數啟動Service，當第一次調用時會分別調用onCreate()和onStart在()；

之后只會調用onStart()；

通過函數StopService()結束Service，會調用onDestroy()；

調用BindService()：當Service未創建時調用onCreate()和onBind()；當創建了只調用onBind()；

使用函數bindService()和函數unbindService()可以綁定和解除綁定

對已經綁定的Service調用bindService()無效，即多次調用bindService()和調用一次bindService()一樣。 unbindService()只能使用一次，即對于一個綁定的Service，只能調用一次unbindService()，多次調用會產生錯誤

該函數原型為：

bindService(Intent,ServiceConnection,BIND_AUTO_CREATE);

ServiceConnection是一個服務連接類，必須實現以下兩個函數：

public?void?onServiceConnected(ComponentName?arg0,?IBinder?arg1)//連接成功時調用 public?void?onServiceDisconnected(ComponentName?arg0)????????//連接失敗時調用

????示例如下：

private?ServiceConnection?conn=new?ServiceConnection()?{@Overridepublic?void?onServiceConnected(ComponentName?arg0,?IBinder?arg1)?{//?TODO?Auto-generated?method?stubToast.makeText(MainActivity.this,?"success",?Toast.LENGTH_LONG).show();Log.i("SERVICE","success");}@Overridepublic?void?onServiceDisconnected(ComponentName?arg0)?{//?TODO?Auto-generated?method?stubToast.makeText(MainActivity.this,?"errer",?Toast.LENGTH_LONG);Log.i("SERVICE","errer");}

????

????

Service實例：

????MainActivity.java:

private?ServiceConnection?conn=new?ServiceConnection()?{@Overridepublic?void?onServiceConnected(ComponentName?arg0,?IBinder?arg1)?{//?TODO?Auto-generated?method?stubToast.makeText(MainActivity.this,?"success",?Toast.LENGTH_LONG).show();Log.i("SERVICE","success");}@Overridepublic?void?onServiceDisconnected(ComponentName?arg0)?{//?TODO?Auto-generated?method?stubToast.makeText(MainActivity.this,?"errer",?Toast.LENGTH_LONG);Log.i("SERVICE","errer");} };protected?void?onCreate(Bundle?savedInstanceState)?{super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button?button1=(Button)this.findViewById(R.id.btn1);Button?button2=(Button)this.findViewById(R.id.btn3);Button?button3=(Button)this.findViewById(R.id.btn4);Button?button4=(Button)this.findViewById(R.id.btn5);button1.setOnClickListener(new?OnClickListener()?{@Overridepublic?void?onClick(View?arg0)?{//?TODO?Auto-generated?method?stubstartService(new?Intent(MainActivity.this,NewService.class));}});button2.setOnClickListener(new?OnClickListener()?{@Overridepublic?void?onClick(View?arg0)?{//?TODO?Auto-generated?method?stubstopService(new?Intent(MainActivity.this,NewService.class));}});button3.setOnClickListener(new?OnClickListener()?{@Overridepublic?void?onClick(View?arg0)?{//?TODO?Auto-generated?method?stubbindService(new?Intent(MainActivity.this,NewService.class),conn,BIND_AUTO_CREATE);}});button4.setOnClickListener(new?OnClickListener()?{@Overridepublic?void?onClick(View?arg0)?{//?TODO?Auto-generated?method?stubunbindService(conn);}}); ｝

NewService.java:

public?class?NewService?extends?Service?{@Overridepublic?IBinder?onBind(Intent?arg0)?{//?TODO?Auto-generated?method?stubToast.makeText(NewService.this,?"onBind",?Toast.LENGTH_LONG).show();Log.i("SERVICE","onbind");return?null;}public?void?onCreate()?{super.onCreate();Log.i("SERVICE","oncreat");Toast.makeText(NewService.this,?"onCreat",?Toast.LENGTH_LONG).show();}public?void?onStart(Intent?intent,int?startId)?{Log.i("SERVICE","onstart");Toast.makeText(NewService.this,?"onStart",?Toast.LENGTH_LONG).show();}public?void?onDestroy()?{Log.i("SERVICE","ondestory");Toast.makeText(NewService.this,?"onDestory",?Toast.LENGTH_LONG).show();} }

Activity.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical"?><Button?android:id="@+id/btn1"?android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="start"/><Button?android:id="@+id/btn3"?android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="stop"/><Button?android:id="@+id/btn4"?android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="bind"/><Button?android:id="@+id/btn5"?android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="unbind"/>???? </LinearLayout>

AndroidManifest.xml增加：

?<service?android:name="com.example.new1.NewService"/>

轉載于:https://blog.51cto.com/aslonely/1616665

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